Where can I see any download logs?

Question

linux

Good afternoon, I ran into such a problem, took a dedicated server, installed debian 8 and installed the Xen hypervisor.
I set the boot priority in grub to xen and the server itself disappeared from the network, I climbed through kvm to the server and just in case checked whether virtualization support was enabled in the BIOS, it was enabled, and by default. In kvm I observe endless attempts to boot Xen, it comes to the moment downloads and goes into reboot, I actually don’t have time to see anything, I would like to know where you can see the logs and has anyone come across this?
Thanks in advance for your replies and your time.
UPD:
I found this fragment in the logs (/var/log/messages), does it affect the loading crash?

Jan 31 13:52:21 rtk-xen kernel: [    0.651022] random: systemd-udevd: uninitialized urandom read (16 bytes read, 34 bits of entropy available)
Jan 31 13:52:21 rtk-xen kernel: [    0.660403] hidraw: raw HID events driver (C) Jiri Kosina
Jan 31 13:52:21 rtk-xen kernel: [    0.675261] ACPI Error: [\_SB_.PCI0.LPCB.H_EC.ECAV] Namespace lookup failure, AE_NOT_FOUND (20140424/psargs-359)
Jan 31 13:52:21 rtk-xen kernel: [    0.675730] ACPI Error: Method parse/execution failed [\_TZ_.TZ00._TMP] (Node ffff88102d8ab540), AE_NOT_FOUND (20140424/psparse-536)
Jan 31 13:52:21 rtk-xen kernel: [    0.676316] ACPI Error: [\_SB_.PCI0.LPCB.H_EC.ECAV] Namespace lookup failure, AE_NOT_FOUND (20140424/psargs-359)
Jan 31 13:52:21 rtk-xen kernel: [    0.676594] ACPI Error: 
Jan 31 13:52:21 rtk-xen kernel: [    0.676643] ACPI: bus type USB registered
Jan 31 13:52:21 rtk-xen kernel: [    0.676665] usbcore: registered new interface driver usbfs
Jan 31 13:52:21 rtk-xen kernel: [    0.676673] usbcore: registered new interface driver hub
Jan 31 13:52:21 rtk-xen kernel: [    0.676785] usbcore: registered new device driver usb
Jan 31 13:52:21 rtk-xen kernel: [    0.677135] Method parse/execution failed [\_TZ_.TZ00._TMP] (Node ffff88102d8ab540), AE_NOT_FOUND (20140424/psparse-536)
Jan 31 13:52:21 rtk-xen kernel: [    0.677891] ACPI: Fan [FAN0] (off)
Jan 31 13:52:21 rtk-xen kernel: [    0.677913] SCSI subsystem initialized
Jan 31 13:52:21 rtk-xen kernel: [    0.678518] ACPI Error: [\_SB_.PCI0.LPCB.H_EC.ECAV] Namespace lookup failure, AE_NOT_FOUND (20140424/psargs-359)
Jan 31 13:52:21 rtk-xen kernel: [    0.678953] ACPI Error: Method parse/execution failed [\_TZ_.TZ01._TMP] (Node ffff88102d8ab478), AE_NOT_FOUND (20140424/psparse-536)
Jan 31 13:52:21 rtk-xen kernel: [    0.679443] ACPI Error: [\_SB_.PCI0.LPCB.H_EC.ECAV] Namespace lookup failure, AE_NOT_FOUND (20140424/psargs-359)
Jan 31 13:52:21 rtk-xen kernel: [    0.679844] ACPI Error: Method parse/execution failed [\_TZ_.TZ01._TMP] (Node ffff88102d8ab478), AE_NOT_FOUND (20140424/psparse-536)

UPD:
It reaches loading Dom0 and after that it reboots, actually the last stage, so to speak, something does not work

Answer 1

I solved the problem, I'll leave the information here:
The problem was the incompatibility of Skylake technology with xen 4.5 and below. From the Debian 8 repository, it downloads xen 4.4, so to solve the problem, you either need to install xen 4.8 from sorts (there was a release), or switch to Debian 9 and xen 4.8 is installed from the repository there.
I want to thank Ilya for " does not work correctly on all machines ", after that I deigned to examine the list of xen versions.